|Publication number||US7266657 B2|
|Application number||US 10/974,870|
|Publication date||Sep 4, 2007|
|Filing date||Oct 27, 2004|
|Priority date||Oct 27, 2004|
|Also published as||US20060090052|
|Publication number||10974870, 974870, US 7266657 B2, US 7266657B2, US-B2-7266657, US7266657 B2, US7266657B2|
|Original Assignee||Kwok-Yan Leung|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (2), Classifications (5), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to a data protection device and a method of securing data, and in particular to a device installation that supports all types of storage media interface with higher data access rate and more efficient usage of disk space.
2. The Related Art
Conventional data protection is based on the hardware implementation of a data protection circuit, which is installed between a conventional hard disk interface and the data bus. For the operating system, the specially adapted hard disk is treated as a conventional hard disk, with no need of any driver programs. Data can be written directly into a data storage device without any driver programs. Therefore, the data access rate of the hard disk is not affected, only that the disk operation has become more secure.
However, there is a limitation to using the prior art data protection technique, which can only be used on the storage media interface that is invariably set for two IDE hard disks or logical drives. After assigning the disk space for the primary data area and the virtual data area, the disk space remaining is allotted to logical drives, which is the disk space that a user can utilize. But this prior art data protection technique cannot be used on newer generation of storage media interface cards that are often used on a single hard disk, such as SATA. Therefore, the operation mode and architecture of the prior art technique need to be adjusted to meet the requirements of current hard disk technology.
Another inherent weakness in the architecture and the operation mode of the prior art technique is that the allotment of disk space to the primary data area and the virtual data area has to be equal. Since the data address of the saved in a hard disk might not be contiguous, the one-to-one copying of the entire data block though easy to implement often is a waste of the disk space. Therefore, the overall data access rate is slowed down because of the unnecessary disk action on the non-data sectors.
Since the prior art technique adopts the one-to-one copying, the system can only perform inflexible data copying and data recovery, but such system cannot support multiple node data protection and multiple selection of data reference point for archiving and data restoration.
The primary objective of the present invention is to provide a data protection device that supports all types of storage media interface.
The secondary objective of the invention is to provide a data securing technique that makes use of data flags recorded in a sector index table to indicate the write status of certain sectors when data are written into certain sectors, whereby the disk space needed for archiving can be considerably reduced, and the overall data access rate can be shortened.
The third objective of the invention is to provide a data securing technique that enables users to define the data reference point for archiving and data restoration operations, such as certain hour or date, and supports multiple node data protection through overlapping data copying and restoration processes.
In accordance with the first aspect of the invention, the data protection device is composed of a disk space allotment unit, a marking unit and an archiving unit.
In accordance with the second aspect of the invention, the disk space allotment unit is to reorganize multiple sectors existing in the data storage device for allotment of disk space to newly defined sections, such as a working data section, a sector index table and a duplicate data section of the data protection device.
In accordance with the third aspect of the invention, the marking unit is to mark the data flag of a certain sector in the sector index table at the same time that data are written into the working data section, where the data flag is used to indicate whether the write status of certain sector is enabled.
In accordance with the fourth aspect of the invention, the archiving unit is to use the data flag of a certain sector marked in the sector index table to copy the data of respective sector from the working data section and associated data flag value from the sector index table to the duplicate data section.
In accordance with the fifth aspect of the invention, a data recovery unit is included in the data protection device, so that when some of the data saved in the data protection device are corrupted or the data storage device is attacked by computer viruses, the user is able to invoke the data recovery procedure to restore the original data in the working data section using the data copy from the duplicate data section.
In accordance with the sixth aspect of the invention, a disk space tracking unit is to collect updated information of disk space used so far and disk space still remaining in the working data section, the sector index table, and the duplicate data section.
In accordance with the seventh aspect of the invention, every time when the archiving unit or the data recovery unit is invoked, the disk space tracking unit is first consulted to obtain updated information about the disk usage in order to prevent overwriting of any valid data in the destination data section. Also, through the service of the disk space tracking unit, the user is able to obtain useful information about the disk usage in the working data section, the sector index table and the duplicate data section continuously for other applications.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
The data securing technique employed by the data protection device 10 in accordance with the present invention bears some resemblance to the prior art technique, such as the use of the conventional data copying and restoration procedures for manipulation of data in the data storage device, but the present invention has introduced the re-allocation of the entire disk space on the storage device so as to achieve higher data access rate and more efficient usage of disk space, in which multiple sectors existing in the data storage unit 16 are first reorganized for allotment of disk space to newly defined sections, such as a working data section, a sector index table and a duplicate data section.
When the operating system is about to write data into a certain sector of the working data section 30, such as the data content in sector 30A, the marking unit 20 is to check and mark the data flag 32 in the sector index table, which indicates whether valid data are present in the sectors 30A to 30F. If the sector 30A has data content ‘FF’, then the data flag 32 of respective sector shall be marked as ‘1’ indicating valid data are present in the sector 30A, but if the sector 30B does not have any data, the data flag 32 of respective sector in the sector index table 31 shall be marked as ‘0’.
The present invention is characterized in that the disk space used by the working data section 30 and the duplicate data section 34 does not have to be equal, unlike the prior art technique. Since the storage media interface used by the data protection device 10 is not limited to supporting two disk drives, the present invention is able to support any type of storage media interface, so the number of disk drives being connected can be changed for different system configurations.
The marking unit 20 of the data protection device 10 is used to record the data flags 32 of all sectors used by the working data section 30 in the sector index table 31, so that, for example, sector 30B with no data shall be skipped over in the archiving procedure. This can also explain why the disk space used by the working data section 30 and the duplicate data section 34 does not have to be the same.
When the data recovery procedure is invoked, the data recovery unit 24 uses the data flags 32 of certain sectors marked in the sector index table 31 as shown in
Using the same data manipulation, in the event of a computer disaster, data need to be restored to the working data section 30, the data recovery unit 24 is first to check on the data flags 32, 40 in the sector index table 31, and then respective data in the duplicate data section 34 are copied to the sectors 30A to 30I of the working data section 30, and the data in the working data section 30 before the disaster occurs. The data flags 32, 40 of the respective sectors are also restored to the original values in the sector index table 31.
The backup interface 26 is to use a suitable bus interface, such as the small computer system interface (SCSI), the fiber channel interface (FC), the peripheral component interconnect (PCI), the flash card interface, the serial storage architecture (SSA), the integrated device electronics (IDE), the universal serial bus (USB), IEEE 1394, the personal computer memory card international association (PCMCIA), serial ATA (SATA), and parallel ATA (PATA).
The data backup device 28 is to use a suitable storage medium, such as a hard disk, an optical disk burner, a ZIP disk drive, a MO disk drive, a tape drive, and a card reader. Therefore, the data backup device 28 can be replaceable storage media, which enables the user reference points, such as certain hour or date, for data copying and restoration operation. However, it shall be noted that the disk space in the duplicate data section 34 shall be adjusted each time after the storage medium in the data backup device 28 is replaced so as to reflect the disk space used thus far and the disk space still remaining.
This innovative use of a sector index table containing data flags in the present invention enables the user to use less access time and disk space usage to accomplish data archiving and data recovery. Also, another feature of the data protection device is a multi-node data protection using the multiple selection of data reference point.
Although the present invention has been described with reference to the preferred embodiments thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|Cooperative Classification||G06F21/78, G06F2221/2101|
|Mar 1, 2011||FPAY||Fee payment|
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|Jan 23, 2015||FPAY||Fee payment|
Year of fee payment: 8